針對ETCD版本 3.2.17
--name 節點名稱
default: "default"
env variable: ETCD_NAME
這個值和--initial-cluster flag (e.g., default=http://localhost:2380)中的key值一一對應，如果在集群環境中，name必須是唯一的，建議用主機名稱或者機器ID。
--data-dir 數據存儲目錄
default: "${name}.etcd"
env variable: ETCD_DATA_DIR
--wal-dir
default: ""
env variable: ETCD_WAL_DIR
存放預寫式日志,最大的作用是記錄了整個數據變化的全部歷程。未設置，共用--data-dir文件所在目錄。
--snapshot-count
default: "100000"
env variable: ETCD_SNAPSHOT_COUNT
數據快照觸發數量，etcd處理指定的次數的事務提交后，生產數據快照
--heartbeat-interval 客戶端連接后的心跳間隔（毫秒）
default: "100"
env variable: ETCD_HEARTBEAT_INTERVAL
--election-timeout 集群選舉的超時時間
default: "1000"
env variable: ETCD_ELECTION_TIMEOUT
--listen-peer-urls
本節點與其他節點進行數據交換(選舉，數據同步)的監聽地址，地址寫法是 scheme://IP:port，可以多個並用逗號隔開，如果配置是http://0.0.0.0:2379,將不限制node訪問地址
default: "http://localhost:2380"
env variable: ETCD_LISTEN_PEER_URLS
example: "http://10.0.0.1:2380"
invalid example: "http://example.com:2380" (domain name is invalid for binding)
--listen-client-urls
本節點訪問地址，地址寫法是 scheme://IP:port，可以多個並用逗號隔開，如果配置是http://0.0.0.0:2379,將不限制node訪問地址
default: "http://localhost:2379"
env variable: ETCD_LISTEN_CLIENT_URLS
example: "http://10.0.0.1:2379"
invalid example: "http://example.com:2379" (domain name is invalid for binding)
--max-snapshots
最大快照數量 0表示不限制,在window平台設置無效。
default: 5
env variable: ETCD_MAX_SNAPSHOTS
--max-wals
最大預寫日志數量 0表示不限制,在window平台設置無效。
default: 5
env variable: ETCD_MAX_WALS
--cors
Comma-separated white list of origins for CORS (cross-origin resource sharing).
default: none
env variable: ETCD_CORS
集群配置
--initial-advertise-peer-urls
通知其他節點與本節點進行數據交換（選舉，同步）的地址，URL可以使用domain地址。
與--listener-peer-urls不同在於listener-peer-urls用於請求客戶端的接入控制，initial-advertise-peer-urls是告知其他集群節點訪問哪個URL，一般來說，initial-advertise-peer-urlsl將是istener-peer-urls的子集
default: "http://localhost:2380"
env variable: ETCD_INITIAL_ADVERTISE_PEER_URLS
example: "http://example.com:2380, http://10.0.0.1:2380"
--initial-cluster
集群所有節點配置，多個用逗號隔開。
default: "default=http://localhost:2380"
env variable: ETCD_INITIAL_CLUSTER
The key is the value of the --name flag for each node provided. The default uses default for the key because this is the default for the --name flag.
--initial-cluster-state
節點初始化方式，new 表示如果沒有集群不存在，創建新集群，existing表示如果集群不存在，節點將處於加入集群失敗狀態。
default: "new"
env variable: ETCD_INITIAL_CLUSTER_STATE
--initial-cluster-token
集群唯一標識，相同標識的節點將視為在一個集群內。
default: "etcd-cluster"
env variable: ETCD_INITIAL_CLUSTER_TOKEN
--advertise-client-urls
用於通知其他ETCD節點，客戶端接入本節點的監聽地址，一般來說advertise-client-urls是listen-client-urls子集
default: "http://localhost:2379"
env variable: ETCD_ADVERTISE_CLIENT_URLS
example: "http://example.com:2379, http://10.0.0.1:2379"
注意，不能寫http://localhost:237，這樣就是通知其他節點，可以用localhost訪問，將導致ectd的客戶端用localhost訪問本地,導致訪問不通。還有一個更可怕情況，ectd布置了代理層，代理層將一直通過locahost訪問自己的代理接口，導致無限循環。
--discovery
集群發現服務地址
default: none
env variable: ETCD_DISCOVERY
--discovery-srv
DNS發現服務地址
default: none
env variable: ETCD_DISCOVERY_SRV
--discovery-fallback
Expected behavior ("exit" or "proxy") when discovery services fails. "proxy" supports v2 API only.
default: "proxy"
env variable: ETCD_DISCOVERY_FALLBACK
--discovery-proxy
HTTP proxy to use for traffic to discovery service.
default: none
env variable: ETCD_DISCOVERY_PROXY
--strict-reconfig-check
Reject reconfiguration requests that would cause quorum loss.
default: false
env variable: ETCD_STRICT_RECONFIG_CHECK
--auto-compaction-retention
Auto compaction retention for mvcc key value store in hour. 0 means disable auto compaction.
default: 0
env variable: ETCD_AUTO_COMPACTION_RETENTION
--enable-v2 是否接受V2的API訪問
default: true
env variable: ETCD_ENABLE_V2
代理
--proxy
Proxy mode setting ("off", "readonly" or "on").
default: "off"
env variable: ETCD_PROXY
--proxy-failure-wait
Time (in milliseconds) an endpoint will be held in a failed state before being reconsidered for proxied requests.
default: 5000
env variable: ETCD_PROXY_FAILURE_WAIT
--proxy-refresh-interval
代理節點刷新時間間隔（毫秒）
Time (in milliseconds) of the endpoints refresh interval.
default: 30000
env variable: ETCD_PROXY_REFRESH_INTERVAL
--proxy-dial-timeout
Time (in milliseconds) for a dial to timeout or 0 to disable the timeout
default: 1000
env variable: ETCD_PROXY_DIAL_TIMEOUT
--proxy-write-timeout
Time (in milliseconds) for a write to timeout or 0 to disable the timeout.
default: 5000
env variable: ETCD_PROXY_WRITE_TIMEOUT
--proxy-read-timeout
Time (in milliseconds) for a read to timeout or 0 to disable the timeout.
Don't change this value if using watches because use long polling requests.
default: 0
env variable: ETCD_PROXY_READ_TIMEOUT
安全
--cert-file
Path to the client server TLS cert file.
default: none
env variable: ETCD_CERT_FILE
--key-file
Path to the client server TLS key file.
default: none
env variable: ETCD_KEY_FILE
--client-cert-auth
Enable client cert authentication.
default: false
env variable: ETCD_CLIENT_CERT_AUTH
--trusted-ca-file
Path to the client server TLS trusted CA key file.
default: none
env variable: ETCD_TRUSTED_CA_FILE
--auto-tls
Client TLS using generated certificates
default: false
env variable: ETCD_AUTO_TLS
--peer-cert-file
Path to the peer server TLS cert file.
default: none
env variable: ETCD_PEER_CERT_FILE
--peer-key-file
Path to the peer server TLS key file.
default: none
env variable: ETCD_PEER_KEY_FILE
--peer-client-cert-auth
Enable peer client cert authentication.
default: false
env variable: ETCD_PEER_CLIENT_CERT_AUTH
--peer-trusted-ca-file
Path to the peer server TLS trusted CA file.
default: none
env variable: ETCD_PEER_TRUSTED_CA_FILE
--peer-auto-tls
Peer TLS using generated certificates
default: false
env variable: ETCD_PEER_AUTO_TLS
日志
--debug
Drop the default log level to DEBUG for all subpackages.
default: false (INFO for all packages)
env variable: ETCD_DEBUG
--log-package-levels
Set individual etcd subpackages to specific log levels. An example being etcdserver=WARNING,security=DEBUG
default: none (INFO for all packages)
env variable: ETCD_LOG_PACKAGE_LEVELS
不安全配置
--force-new-cluster
Force to create a new one-member cluster. It commits configuration changes forcing to remove all existing members in the cluster and add itself. It needs to be set to restore a backup.
default: false
env variable: ETCD_FORCE_NEW_CLUSTER
其他配置
--version
Print the version and exit.
default: false
--config-file
Load server configuration from a file.
default: none
Profiling flags
--enable-pprof
Enable runtime profiling data via HTTP server. Address is at client URL + "/debug/pprof/"
default: false
--metrics
Set level of detail for exported metrics, specify 'extensive' to include histogram metrics.
default: basic
認證
--auth-token
Specify a token type and token specific options, especially for JWT. Its format is "type,var1=val1,var2=val2,…". Possible type is 'simple' or 'jwt'. Possible variables are 'sign-method' for specifying a sign method of jwt (its possible values are 'ES256', 'ES384', 'ES512', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', 'RS512', 'PS256', 'PS384', or 'PS512'), 'pub-key' for specifying a path to a public key for verifying jwt, and 'priv-key' for specifying a path to a private key for signing jwt.
Example option of JWT: '–auth-token jwt,pub-key=app.rsa.pub,priv-key=app.rsa,sign-method=RS512'
default: "simple"